Securities, AFS Debt Securities, Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Within one year	$ 80,906
From one to five years	660,218
From five to ten years	196,034
After ten years	985,102
Amortized cost	1,922,260	$ 1,739,299
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Within one year	80,486
From one to five years	625,704
From five to ten years	187,005
After ten years	919,999
Fair value	$ 1,813,194	$ 1,574,664